> For the complete documentation index, see [llms.txt](https://til.notdu.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://til.notdu.com/database/intro-to-database-systems/buffer-pool-and-memory-management/dirty-pages.md).

# Dirty Pages

FAST: If a page in the buffer pool is not dirty, then the DBMS can simply "drop" it.

SLOW: If a page is dirty, then the DBMS must write back to disk to ensure that its changes are persisted

Trade-off between fast evictions versus dirty writing pages that will not be read again in the future.